1/* Command line option handling. 2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 3 Free Software Foundation, Inc. 4 Contributed by Neil Booth. 5 6This file is part of GCC. 7 8GCC is free software; you can redistribute it and/or modify it under 9the terms of the GNU General Public License as published by the Free 10Software Foundation; either version 3, or (at your option) any later 11version. 12 13GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14WARRANTY; without even the implied warranty of MERCHANTABILITY or 15FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16for more details. 17 18You should have received a copy of the GNU General Public License 19along with GCC; see the file COPYING3. If not see 20<http://www.gnu.org/licenses/>. */ 21 22#include "config.h" 23#include "system.h" 24#include "intl.h" 25#include "coretypes.h" 26#include "tm.h" 27#include "tree.h" 28#include "rtl.h" 29#include "expr.h" 30#include "ggc.h" 31#include "output.h" 32#include "langhooks.h" 33#include "opts.h" 34#include "options.h" 35#include "flags.h" 36#include "toplev.h" 37#include "params.h" 38#include "diagnostic.h" 39#include "tm_p.h" /* For OPTIMIZATION_OPTIONS. */ 40#include "insn-attr.h" /* For INSN_SCHEDULING. */ 41#include "target.h" 42#include "tree-pass.h" 43#include "dbgcnt.h" 44#include "debug.h" 45#include "plugin.h" 46#include "except.h" 47#include "lto-streamer.h" 48 49/* Value of the -G xx switch, and whether it was passed or not. */ 50unsigned HOST_WIDE_INT g_switch_value; 51bool g_switch_set; 52 53/* Same for selective scheduling. */ 54bool sel_sched_switch_set; 55 56/* True if we should exit after parsing options. */ 57bool exit_after_options; 58 59/* True to warn about any objects definitions whose size is larger 60 than N bytes. Also want about function definitions whose returned 61 values are larger than N bytes, where N is `larger_than_size'. */ 62bool warn_larger_than; 63HOST_WIDE_INT larger_than_size; 64 65/* True to warn about any function whose frame size is larger 66 * than N bytes. */ 67bool warn_frame_larger_than; 68HOST_WIDE_INT frame_larger_than_size; 69 70/* Type(s) of debugging information we are producing (if any). See 71 flags.h for the definitions of the different possible types of 72 debugging information. */ 73enum debug_info_type write_symbols = NO_DEBUG; 74 75/* Level of debugging information we are producing. See flags.h for 76 the definitions of the different possible levels. */ 77enum debug_info_level debug_info_level = DINFO_LEVEL_NONE; 78 79/* A major contribution to object and executable size is debug 80 information size. A major contribution to debug information size 81 is struct descriptions replicated in several object files. The 82 following flags attempt to reduce this information. The basic 83 idea is to not emit struct debugging information in the current 84 compilation unit when that information will be generated by 85 another compilation unit. 86 87 Debug information for a struct defined in the current source 88 file should be generated in the object file. Likewise the 89 debug information for a struct defined in a header should be 90 generated in the object file of the corresponding source file. 91 Both of these case are handled when the base name of the file of 92 the struct definition matches the base name of the source file 93 of the current compilation unit. This matching emits minimal 94 struct debugging information. 95 96 The base file name matching rule above will fail to emit debug 97 information for structs defined in system headers. So a second 98 category of files includes system headers in addition to files 99 with matching bases. 100 101 The remaining types of files are library headers and application 102 headers. We cannot currently distinguish these two types. */ 103 104enum debug_struct_file 105{ 106 DINFO_STRUCT_FILE_NONE, /* Debug no structs. */ 107 DINFO_STRUCT_FILE_BASE, /* Debug structs defined in files with the 108 same base name as the compilation unit. */ 109 DINFO_STRUCT_FILE_SYS, /* Also debug structs defined in system 110 header files. */ 111 DINFO_STRUCT_FILE_ANY /* Debug structs defined in all files. */ 112}; 113 114/* Generic structs (e.g. templates not explicitly specialized) 115 may not have a compilation unit associated with them, and so 116 may need to be treated differently from ordinary structs. 117 118 Structs only handled by reference (indirectly), will also usually 119 not need as much debugging information. */ 120 121static enum debug_struct_file debug_struct_ordinary[DINFO_USAGE_NUM_ENUMS] 122 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }; 123static enum debug_struct_file debug_struct_generic[DINFO_USAGE_NUM_ENUMS] 124 = { DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY, DINFO_STRUCT_FILE_ANY }; 125 126/* Parse the -femit-struct-debug-detailed option value 127 and set the flag variables. */ 128 129#define MATCH( prefix, string ) \ 130 ((strncmp (prefix, string, sizeof prefix - 1) == 0) \ 131 ? ((string += sizeof prefix - 1), 1) : 0) 132 133void 134set_struct_debug_option (const char *spec) 135{ 136 /* various labels for comparison */ 137 static char dfn_lbl[] = "dfn:", dir_lbl[] = "dir:", ind_lbl[] = "ind:"; 138 static char ord_lbl[] = "ord:", gen_lbl[] = "gen:"; 139 static char none_lbl[] = "none", any_lbl[] = "any"; 140 static char base_lbl[] = "base", sys_lbl[] = "sys"; 141 142 enum debug_struct_file files = DINFO_STRUCT_FILE_ANY; 143 /* Default is to apply to as much as possible. */ 144 enum debug_info_usage usage = DINFO_USAGE_NUM_ENUMS; 145 int ord = 1, gen = 1; 146 147 /* What usage? */ 148 if (MATCH (dfn_lbl, spec)) 149 usage = DINFO_USAGE_DFN; 150 else if (MATCH (dir_lbl, spec)) 151 usage = DINFO_USAGE_DIR_USE; 152 else if (MATCH (ind_lbl, spec)) 153 usage = DINFO_USAGE_IND_USE; 154 155 /* Generics or not? */ 156 if (MATCH (ord_lbl, spec)) 157 gen = 0; 158 else if (MATCH (gen_lbl, spec)) 159 ord = 0; 160 161 /* What allowable environment? */ 162 if (MATCH (none_lbl, spec)) 163 files = DINFO_STRUCT_FILE_NONE; 164 else if (MATCH (any_lbl, spec)) 165 files = DINFO_STRUCT_FILE_ANY; 166 else if (MATCH (sys_lbl, spec)) 167 files = DINFO_STRUCT_FILE_SYS; 168 else if (MATCH (base_lbl, spec)) 169 files = DINFO_STRUCT_FILE_BASE; 170 else 171 error ("argument %qs to %<-femit-struct-debug-detailed%> not recognized", 172 spec); 173 174 /* Effect the specification. */ 175 if (usage == DINFO_USAGE_NUM_ENUMS) 176 { 177 if (ord) 178 { 179 debug_struct_ordinary[DINFO_USAGE_DFN] = files; 180 debug_struct_ordinary[DINFO_USAGE_DIR_USE] = files; 181 debug_struct_ordinary[DINFO_USAGE_IND_USE] = files; 182 } 183 if (gen) 184 { 185 debug_struct_generic[DINFO_USAGE_DFN] = files; 186 debug_struct_generic[DINFO_USAGE_DIR_USE] = files; 187 debug_struct_generic[DINFO_USAGE_IND_USE] = files; 188 } 189 } 190 else 191 { 192 if (ord) 193 debug_struct_ordinary[usage] = files; 194 if (gen) 195 debug_struct_generic[usage] = files; 196 } 197 198 if (*spec == ',') 199 set_struct_debug_option (spec+1); 200 else 201 { 202 /* No more -femit-struct-debug-detailed specifications. 203 Do final checks. */ 204 if (*spec != '\0') 205 error ("argument %qs to %<-femit-struct-debug-detailed%> unknown", 206 spec); 207 if (debug_struct_ordinary[DINFO_USAGE_DIR_USE] 208 < debug_struct_ordinary[DINFO_USAGE_IND_USE] 209 || debug_struct_generic[DINFO_USAGE_DIR_USE] 210 < debug_struct_generic[DINFO_USAGE_IND_USE]) 211 error ("%<-femit-struct-debug-detailed=dir:...%> must allow at least" 212 " as much as %<-femit-struct-debug-detailed=ind:...%>"); 213 } 214} 215 216/* Find the base name of a path, stripping off both directories and 217 a single final extension. */ 218static int 219base_of_path (const char *path, const char **base_out) 220{ 221 const char *base = path; 222 const char *dot = 0; 223 const char *p = path; 224 char c = *p; 225 while (c) 226 { 227 if (IS_DIR_SEPARATOR(c)) 228 { 229 base = p + 1; 230 dot = 0; 231 } 232 else if (c == '.') 233 dot = p; 234 c = *++p; 235 } 236 if (!dot) 237 dot = p; 238 *base_out = base; 239 return dot - base; 240} 241 242/* Match the base name of a file to the base name of a compilation unit. */ 243 244static const char *main_input_basename; 245static int main_input_baselength; 246 247static int 248matches_main_base (const char *path) 249{ 250 /* Cache the last query. */ 251 static const char *last_path = NULL; 252 static int last_match = 0; 253 if (path != last_path) 254 { 255 const char *base; 256 int length = base_of_path (path, &base); 257 last_path = path; 258 last_match = (length == main_input_baselength 259 && memcmp (base, main_input_basename, length) == 0); 260 } 261 return last_match; 262} 263 264#ifdef DEBUG_DEBUG_STRUCT 265 266static int 267dump_struct_debug (tree type, enum debug_info_usage usage, 268 enum debug_struct_file criterion, int generic, 269 int matches, int result) 270{ 271 /* Find the type name. */ 272 tree type_decl = TYPE_STUB_DECL (type); 273 tree t = type_decl; 274 const char *name = 0; 275 if (TREE_CODE (t) == TYPE_DECL) 276 t = DECL_NAME (t); 277 if (t) 278 name = IDENTIFIER_POINTER (t); 279 280 fprintf (stderr, " struct %d %s %s %s %s %d %p %s\n", 281 criterion, 282 DECL_IN_SYSTEM_HEADER (type_decl) ? "sys" : "usr", 283 matches ? "bas" : "hdr", 284 generic ? "gen" : "ord", 285 usage == DINFO_USAGE_DFN ? ";" : 286 usage == DINFO_USAGE_DIR_USE ? "." : "*", 287 result, 288 (void*) type_decl, name); 289 return result; 290} 291#define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \ 292 dump_struct_debug (type, usage, criterion, generic, matches, result) 293 294#else 295 296#define DUMP_GSTRUCT(type, usage, criterion, generic, matches, result) \ 297 (result) 298 299#endif 300 301 302bool 303should_emit_struct_debug (tree type, enum debug_info_usage usage) 304{ 305 enum debug_struct_file criterion; 306 tree type_decl; 307 bool generic = lang_hooks.types.generic_p (type); 308 309 if (generic) 310 criterion = debug_struct_generic[usage]; 311 else 312 criterion = debug_struct_ordinary[usage]; 313 314 if (criterion == DINFO_STRUCT_FILE_NONE) 315 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false); 316 if (criterion == DINFO_STRUCT_FILE_ANY) 317 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true); 318 319 type_decl = TYPE_STUB_DECL (type); 320 321 if (criterion == DINFO_STRUCT_FILE_SYS && DECL_IN_SYSTEM_HEADER (type_decl)) 322 return DUMP_GSTRUCT (type, usage, criterion, generic, false, true); 323 324 if (matches_main_base (DECL_SOURCE_FILE (type_decl))) 325 return DUMP_GSTRUCT (type, usage, criterion, generic, true, true); 326 return DUMP_GSTRUCT (type, usage, criterion, generic, false, false); 327} 328 329/* Nonzero means use GNU-only extensions in the generated symbolic 330 debugging information. Currently, this only has an effect when 331 write_symbols is set to DBX_DEBUG, XCOFF_DEBUG, or DWARF_DEBUG. */ 332bool use_gnu_debug_info_extensions; 333 334/* The default visibility for all symbols (unless overridden) */ 335enum symbol_visibility default_visibility = VISIBILITY_DEFAULT; 336 337/* Global visibility options. */ 338struct visibility_flags visibility_options; 339 340/* What to print when a switch has no documentation. */ 341static const char undocumented_msg[] = N_("This switch lacks documentation"); 342 343/* Used for bookkeeping on whether user set these flags so 344 -fprofile-use/-fprofile-generate does not use them. */ 345static bool profile_arc_flag_set, flag_profile_values_set; 346static bool flag_unroll_loops_set, flag_tracer_set; 347static bool flag_value_profile_transformations_set; 348static bool flag_peel_loops_set, flag_branch_probabilities_set; 349static bool flag_inline_functions_set, flag_ipa_cp_set, flag_ipa_cp_clone_set; 350static bool flag_predictive_commoning_set, flag_unswitch_loops_set, flag_gcse_after_reload_set; 351 352/* Functions excluded from profiling. */ 353 354typedef char *char_p; /* For DEF_VEC_P. */ 355DEF_VEC_P(char_p); 356DEF_VEC_ALLOC_P(char_p,heap); 357 358static VEC(char_p,heap) *flag_instrument_functions_exclude_functions; 359static VEC(char_p,heap) *flag_instrument_functions_exclude_files; 360 361typedef const char *const_char_p; /* For DEF_VEC_P. */ 362DEF_VEC_P(const_char_p); 363DEF_VEC_ALLOC_P(const_char_p,heap); 364 365static VEC(const_char_p,heap) *ignored_options; 366 367/* Language specific warning pass for unused results. */ 368bool flag_warn_unused_result = false; 369 370/* Input file names. */ 371const char **in_fnames; 372unsigned num_in_fnames; 373 374static int common_handle_option (size_t scode, const char *arg, int value, 375 unsigned int lang_mask); 376static void handle_param (const char *); 377static unsigned int handle_option (const char **argv, unsigned int lang_mask); 378static char *write_langs (unsigned int lang_mask); 379static void complain_wrong_lang (const char *, const struct cl_option *, 380 unsigned int lang_mask); 381static void handle_options (unsigned int, const char **, unsigned int); 382static void set_debug_level (enum debug_info_type type, int extended, 383 const char *arg); 384 385/* If ARG is a non-negative integer made up solely of digits, return its 386 value, otherwise return -1. */ 387static int 388integral_argument (const char *arg) 389{ 390 const char *p = arg; 391 392 while (*p && ISDIGIT (*p)) 393 p++; 394 395 if (*p == '\0') 396 return atoi (arg); 397 398 return -1; 399} 400 401/* Return a malloced slash-separated list of languages in MASK. */ 402static char * 403write_langs (unsigned int mask) 404{ 405 unsigned int n = 0, len = 0; 406 const char *lang_name; 407 char *result; 408 409 for (n = 0; (lang_name = lang_names[n]) != 0; n++) 410 if (mask & (1U << n)) 411 len += strlen (lang_name) + 1; 412 413 result = XNEWVEC (char, len); 414 len = 0; 415 for (n = 0; (lang_name = lang_names[n]) != 0; n++) 416 if (mask & (1U << n)) 417 { 418 if (len) 419 result[len++] = '/'; 420 strcpy (result + len, lang_name); 421 len += strlen (lang_name); 422 } 423 424 result[len] = 0; 425 426 return result; 427} 428 429/* Complain that switch OPT_INDEX does not apply to this front end. */ 430static void 431complain_wrong_lang (const char *text, const struct cl_option *option, 432 unsigned int lang_mask) 433{ 434 char *ok_langs, *bad_lang; 435 436 /* The LTO front end inherits all the options from the first front 437 end that was used. However, not all the original front end 438 options make sense in LTO. 439 440 A real solution would be to filter this in collect2, but collect2 441 does not have access to all the option attributes to know what to 442 filter. So, in lto1 we silently accept inherited flags and do 443 nothing about it. */ 444 if (lang_mask & CL_LTO) 445 return; 446 447 ok_langs = write_langs (option->flags); 448 bad_lang = write_langs (lang_mask); 449 450 /* Eventually this should become a hard error IMO. */ 451 warning (0, "command line option \"%s\" is valid for %s but not for %s", 452 text, ok_langs, bad_lang); 453 454 free (ok_langs); 455 free (bad_lang); 456} 457 458/* Buffer the unknown option described by the string OPT. Currently, 459 we only complain about unknown -Wno-* options if they may have 460 prevented a diagnostic. Otherwise, we just ignore them. 461 Note that if we do complain, it is only as a warning, not an error; 462 passing the compiler an unrecognised -Wno-* option should never 463 change whether the compilation succeeds or fails. */ 464 465static void postpone_unknown_option_warning(const char *opt) 466{ 467 VEC_safe_push (const_char_p, heap, ignored_options, opt); 468} 469 470/* Produce a warning for each option previously buffered. */ 471 472void print_ignored_options (void) 473{ 474 location_t saved_loc = input_location; 475 476 input_location = 0; 477 478 while (!VEC_empty (const_char_p, ignored_options)) 479 { 480 const char *opt; 481 opt = VEC_pop (const_char_p, ignored_options); 482 warning (0, "unrecognized command line option \"%s\"", opt); 483 } 484 485 input_location = saved_loc; 486} 487 488/* Handle the switch beginning at ARGV for the language indicated by 489 LANG_MASK. Returns the number of switches consumed. */ 490static unsigned int 491handle_option (const char **argv, unsigned int lang_mask) 492{ 493 size_t opt_index; 494 const char *opt, *arg = 0; 495 char *dup = 0; 496 int value = 1; 497 unsigned int result = 0; 498 const struct cl_option *option; 499 500 opt = argv[0]; 501 502 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET); 503 if (opt_index == cl_options_count 504 && (opt[1] == 'W' || opt[1] == 'f' || opt[1] == 'm') 505 && opt[2] == 'n' && opt[3] == 'o' && opt[4] == '-') 506 { 507 /* Drop the "no-" from negative switches. */ 508 size_t len = strlen (opt) - 3; 509 510 dup = XNEWVEC (char, len + 1); 511 dup[0] = '-'; 512 dup[1] = opt[1]; 513 memcpy (dup + 2, opt + 5, len - 2 + 1); 514 opt = dup; 515 value = 0; 516 opt_index = find_opt (opt + 1, lang_mask | CL_COMMON | CL_TARGET); 517 if (opt_index == cl_options_count && opt[1] == 'W') 518 { 519 /* We don't generate warnings for unknown -Wno-* options 520 unless we issue diagnostics. */ 521 postpone_unknown_option_warning (argv[0]); 522 result = 1; 523 goto done; 524 } 525 } 526 527 if (opt_index == cl_options_count) 528 goto done; 529 530 option = &cl_options[opt_index]; 531 532 /* Reject negative form of switches that don't take negatives as 533 unrecognized. */ 534 if (!value && (option->flags & CL_REJECT_NEGATIVE)) 535 goto done; 536 537 /* We've recognized this switch. */ 538 result = 1; 539 540 /* Check to see if the option is disabled for this configuration. */ 541 if (option->flags & CL_DISABLED) 542 { 543 error ("command line option %qs" 544 " is not supported by this configuration", opt); 545 goto done; 546 } 547 548 /* Sort out any argument the switch takes. */ 549 if (option->flags & CL_JOINED) 550 { 551 /* Have arg point to the original switch. This is because 552 some code, such as disable_builtin_function, expects its 553 argument to be persistent until the program exits. */ 554 arg = argv[0] + cl_options[opt_index].opt_len + 1; 555 if (!value) 556 arg += strlen ("no-"); 557 558 if (*arg == '\0' && !(option->flags & CL_MISSING_OK)) 559 { 560 if (option->flags & CL_SEPARATE) 561 { 562 arg = argv[1]; 563 result = 2; 564 } 565 else 566 /* Missing argument. */ 567 arg = NULL; 568 } 569 } 570 else if (option->flags & CL_SEPARATE) 571 { 572 arg = argv[1]; 573 result = 2; 574 } 575 576 /* Now we've swallowed any potential argument, complain if this 577 is a switch for a different front end. */ 578 if (!(option->flags & (lang_mask | CL_COMMON | CL_TARGET))) 579 { 580 complain_wrong_lang (argv[0], option, lang_mask); 581 goto done; 582 } 583 else if ((option->flags & CL_TARGET) 584 && (option->flags & CL_LANG_ALL) 585 && !(option->flags & lang_mask)) 586 { 587 /* Complain for target flag language mismatches if any languages 588 are specified. */ 589 complain_wrong_lang (argv[0], option, lang_mask); 590 goto done; 591 } 592 593 if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE))) 594 { 595 if (!lang_hooks.missing_argument (opt, opt_index)) 596 error ("missing argument to \"%s\"", opt); 597 goto done; 598 } 599 600 /* If the switch takes an integer, convert it. */ 601 if (arg && (option->flags & CL_UINTEGER)) 602 { 603 value = integral_argument (arg); 604 if (value == -1) 605 { 606 error ("argument to \"%s\" should be a non-negative integer", 607 option->opt_text); 608 goto done; 609 } 610 } 611 612 if (option->flag_var) 613 set_option (option, value, arg); 614 615 if (option->flags & lang_mask) 616 { 617 if (lang_hooks.handle_option (opt_index, arg, value) == 0) 618 result = 0; 619#ifdef ENABLE_LTO 620 else 621 lto_register_user_option (opt_index, arg, value, lang_mask); 622#endif 623 } 624 625 if (result && (option->flags & CL_COMMON)) 626 { 627 if (common_handle_option (opt_index, arg, value, lang_mask) == 0) 628 result = 0; 629#ifdef ENABLE_LTO 630 else 631 lto_register_user_option (opt_index, arg, value, CL_COMMON); 632#endif 633 } 634 635 if (result && (option->flags & CL_TARGET)) 636 { 637 if (!targetm.handle_option (opt_index, arg, value)) 638 result = 0; 639#ifdef ENABLE_LTO 640 else 641 lto_register_user_option (opt_index, arg, value, CL_TARGET); 642#endif 643 } 644 645 done: 646 if (dup) 647 free (dup); 648 return result; 649} 650 651/* Handle FILENAME from the command line. */ 652static void 653add_input_filename (const char *filename) 654{ 655 num_in_fnames++; 656 in_fnames = XRESIZEVEC (const char *, in_fnames, num_in_fnames); 657 in_fnames[num_in_fnames - 1] = filename; 658} 659 660/* Add comma-separated strings to a char_p vector. */ 661 662static void 663add_comma_separated_to_vector (VEC(char_p,heap) **pvec, const char* arg) 664{ 665 char *tmp; 666 char *r; 667 char *w; 668 char *token_start; 669 670 /* We never free this string. */ 671 tmp = xstrdup (arg); 672 673 r = tmp; 674 w = tmp; 675 token_start = tmp; 676 677 while (*r != '\0') 678 { 679 if (*r == ',') 680 { 681 *w++ = '\0'; 682 ++r; 683 VEC_safe_push (char_p, heap, *pvec, token_start); 684 token_start = w; 685 } 686 if (*r == '\\' && r[1] == ',') 687 { 688 *w++ = ','; 689 r += 2; 690 } 691 else 692 *w++ = *r++; 693 } 694 if (*token_start != '\0') 695 VEC_safe_push (char_p, heap, *pvec, token_start); 696} 697 698/* Return whether we should exclude FNDECL from instrumentation. */ 699 700bool 701flag_instrument_functions_exclude_p (tree fndecl) 702{ 703 if (VEC_length (char_p, flag_instrument_functions_exclude_functions) > 0) 704 { 705 const char *name; 706 int i; 707 char *s; 708 709 name = lang_hooks.decl_printable_name (fndecl, 0); 710 for (i = 0; 711 VEC_iterate (char_p, flag_instrument_functions_exclude_functions, 712 i, s); 713 ++i) 714 { 715 if (strstr (name, s) != NULL) 716 return true; 717 } 718 } 719 720 if (VEC_length (char_p, flag_instrument_functions_exclude_files) > 0) 721 { 722 const char *name; 723 int i; 724 char *s; 725 726 name = DECL_SOURCE_FILE (fndecl); 727 for (i = 0; 728 VEC_iterate (char_p, flag_instrument_functions_exclude_files, i, s); 729 ++i) 730 { 731 if (strstr (name, s) != NULL) 732 return true; 733 } 734 } 735 736 return false; 737} 738 739 740/* Decode and handle the vector of command line options. LANG_MASK 741 contains has a single bit set representing the current 742 language. */ 743static void 744handle_options (unsigned int argc, const char **argv, unsigned int lang_mask) 745{ 746 unsigned int n, i; 747 748 for (i = 1; i < argc; i += n) 749 { 750 const char *opt = argv[i]; 751 752 /* Interpret "-" or a non-switch as a file name. */ 753 if (opt[0] != '-' || opt[1] == '\0') 754 { 755 if (main_input_filename == NULL) 756 { 757 main_input_filename = opt; 758 main_input_baselength 759 = base_of_path (main_input_filename, &main_input_basename); 760 } 761 add_input_filename (opt); 762 n = 1; 763 continue; 764 } 765 766 n = handle_option (argv + i, lang_mask); 767 768 if (!n) 769 { 770 n = 1; 771 error ("unrecognized command line option \"%s\"", opt); 772 } 773 } 774} 775 776/* Parse command line options and set default flag values. Do minimal 777 options processing. */ 778void 779decode_options (unsigned int argc, const char **argv) 780{ 781 static bool first_time_p = true; 782 static int initial_min_crossjump_insns; 783 static int initial_max_fields_for_field_sensitive; 784 static int initial_loop_invariant_max_bbs_in_loop; 785 static unsigned int initial_lang_mask; 786 787 unsigned int i, lang_mask; 788 int opt1; 789 int opt2; 790 int opt3; 791 int opt1_max; 792 793 if (first_time_p) 794 { 795 /* Perform language-specific options initialization. */ 796 initial_lang_mask = lang_mask = lang_hooks.init_options (argc, argv); 797 798 lang_hooks.initialize_diagnostics (global_dc); 799 800 /* Save initial values of parameters we reset. */ 801 initial_min_crossjump_insns 802 = compiler_params[PARAM_MIN_CROSSJUMP_INSNS].value; 803 initial_max_fields_for_field_sensitive 804 = compiler_params[PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE].value; 805 initial_loop_invariant_max_bbs_in_loop 806 = compiler_params[PARAM_LOOP_INVARIANT_MAX_BBS_IN_LOOP].value; 807 } 808 else 809 lang_mask = initial_lang_mask; 810 811 /* Scan to see what optimization level has been specified. That will 812 determine the default value of many flags. */ 813 for (i = 1; i < argc; i++) 814 { 815 if (!strcmp (argv[i], "-O")) 816 { 817 optimize = 1; 818 optimize_size = 0; 819 } 820 else if (argv[i][0] == '-' && argv[i][1] == 'O') 821 { 822 /* Handle -Os, -O2, -O3, -O69, ... */ 823 const char *p = &argv[i][2]; 824 825 if ((p[0] == 's') && (p[1] == 0)) 826 { 827 optimize_size = 1; 828 829 /* Optimizing for size forces optimize to be 2. */ 830 optimize = 2; 831 } 832 else 833 { 834 const int optimize_val = read_integral_parameter (p, p - 2, -1); 835 if (optimize_val != -1) 836 { 837 optimize = optimize_val; 838 if ((unsigned int) optimize > 255) 839 optimize = 255; 840 optimize_size = 0; 841 } 842 } 843 } 844 } 845 846 /* Use priority coloring if cover classes is not defined for the 847 target. */ 848 if (targetm.ira_cover_classes == NULL) 849 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY; 850 851 /* -O1 optimizations. */ 852 opt1 = (optimize >= 1); 853 flag_defer_pop = opt1; 854#ifdef DELAY_SLOTS 855 flag_delayed_branch = opt1; 856#endif 857#ifdef CAN_DEBUG_WITHOUT_FP 858 flag_omit_frame_pointer = opt1; 859#endif 860 flag_guess_branch_prob = opt1; 861 flag_cprop_registers = opt1; 862 flag_forward_propagate = opt1; 863 flag_if_conversion = opt1; 864 flag_if_conversion2 = opt1; 865 flag_ipa_pure_const = opt1; 866 flag_ipa_reference = opt1; 867 flag_merge_constants = opt1; 868 flag_split_wide_types = opt1; 869 flag_tree_ccp = opt1; 870 flag_tree_dce = opt1; 871 flag_tree_dom = opt1; 872 flag_tree_dse = opt1; 873 flag_tree_ter = opt1; 874 flag_tree_sra = opt1; 875 flag_tree_copyrename = opt1; 876 flag_tree_fre = opt1; 877 flag_tree_copy_prop = opt1; 878 flag_tree_sink = opt1; 879 flag_tree_ch = opt1; 880 881 /* -O2 optimizations. */ 882 opt2 = (optimize >= 2); 883 flag_inline_small_functions = opt2; 884 flag_indirect_inlining = opt2; 885 flag_thread_jumps = opt2; 886 flag_crossjumping = opt2; 887 flag_optimize_sibling_calls = opt2; 888 flag_cse_follow_jumps = opt2; 889 flag_gcse = opt2; 890 flag_expensive_optimizations = opt2; 891 flag_rerun_cse_after_loop = opt2; 892 flag_caller_saves = opt2; 893 flag_peephole2 = opt2; 894#ifdef INSN_SCHEDULING 895 /* Only run the pre-regalloc scheduling pass if optimizing for speed. */ 896 flag_schedule_insns = opt2 && ! optimize_size; 897 flag_schedule_insns_after_reload = opt2; 898#endif 899 flag_regmove = opt2; 900 flag_strict_aliasing = opt2; 901 flag_strict_overflow = opt2; 902 flag_reorder_blocks = opt2; 903 flag_reorder_functions = opt2; 904 flag_tree_vrp = opt2; 905 flag_tree_builtin_call_dce = opt2; 906 flag_tree_pre = opt2; 907 flag_tree_switch_conversion = opt2; 908 flag_ipa_cp = opt2; 909 flag_ipa_sra = opt2; 910 911 /* Track fields in field-sensitive alias analysis. */ 912 set_param_value ("max-fields-for-field-sensitive", 913 (opt2) ? 100 : initial_max_fields_for_field_sensitive); 914 915 /* For -O1 only do loop invariant motion for very small loops. */ 916 set_param_value ("loop-invariant-max-bbs-in-loop", 917 (opt2) ? initial_loop_invariant_max_bbs_in_loop : 1000); 918 919 /* -O3 optimizations. */ 920 opt3 = (optimize >= 3); 921 flag_predictive_commoning = opt3; 922 flag_inline_functions = opt3; 923 flag_unswitch_loops = opt3; 924 flag_gcse_after_reload = opt3; 925 flag_tree_vectorize = opt3; 926 flag_ipa_cp_clone = opt3; 927 if (flag_ipa_cp_clone) 928 flag_ipa_cp = 1; 929 930 /* Just -O1/-O0 optimizations. */ 931 opt1_max = (optimize <= 1); 932 align_loops = opt1_max; 933 align_jumps = opt1_max; 934 align_labels = opt1_max; 935 align_functions = opt1_max; 936 937 if (optimize_size) 938 { 939 /* Inlining of functions reducing size is a good idea regardless of them 940 being declared inline. */ 941 flag_inline_functions = 1; 942 943 /* Basic optimization options. */ 944 optimize_size = 1; 945 if (optimize > 2) 946 optimize = 2; 947 948 /* We want to crossjump as much as possible. */ 949 set_param_value ("min-crossjump-insns", 1); 950 } 951 else 952 set_param_value ("min-crossjump-insns", initial_min_crossjump_insns); 953 954 if (first_time_p) 955 { 956 /* Initialize whether `char' is signed. */ 957 flag_signed_char = DEFAULT_SIGNED_CHAR; 958 /* Set this to a special "uninitialized" value. The actual default is 959 set after target options have been processed. */ 960 flag_short_enums = 2; 961 962 /* Initialize target_flags before OPTIMIZATION_OPTIONS so the latter can 963 modify it. */ 964 target_flags = targetm.default_target_flags; 965 966 /* Some targets have ABI-specified unwind tables. */ 967 flag_unwind_tables = targetm.unwind_tables_default; 968 } 969 970#ifdef ENABLE_LTO 971 /* Clear any options currently held for LTO. */ 972 lto_clear_user_options (); 973#endif 974 975#ifdef OPTIMIZATION_OPTIONS 976 /* Allow default optimizations to be specified on a per-machine basis. */ 977 OPTIMIZATION_OPTIONS (optimize, optimize_size); 978#endif 979 980 handle_options (argc, argv, lang_mask); 981 982 if (dump_base_name && ! IS_ABSOLUTE_PATH (dump_base_name)) 983 { 984 /* First try to make DUMP_BASE_NAME relative to the DUMP_DIR_NAME 985 directory. Then try to make DUMP_BASE_NAME relative to the 986 AUX_BASE_NAME directory, typically the directory to contain 987 the object file. */ 988 if (dump_dir_name) 989 dump_base_name = concat (dump_dir_name, dump_base_name, NULL); 990 else if (aux_base_name) 991 { 992 const char *aux_base; 993 994 base_of_path (aux_base_name, &aux_base); 995 if (aux_base_name != aux_base) 996 { 997 int dir_len = aux_base - aux_base_name; 998 char *new_dump_base_name = 999 XNEWVEC (char, strlen(dump_base_name) + dir_len + 1); 1000 1001 /* Copy directory component from AUX_BASE_NAME. */ 1002 memcpy (new_dump_base_name, aux_base_name, dir_len); 1003 /* Append existing DUMP_BASE_NAME. */ 1004 strcpy (new_dump_base_name + dir_len, dump_base_name); 1005 dump_base_name = new_dump_base_name; 1006 } 1007 } 1008 } 1009 1010 /* Handle related options for unit-at-a-time, toplevel-reorder, and 1011 section-anchors. */ 1012 if (!flag_unit_at_a_time) 1013 { 1014 if (flag_section_anchors == 1) 1015 error ("Section anchors must be disabled when unit-at-a-time " 1016 "is disabled."); 1017 flag_section_anchors = 0; 1018 if (flag_toplevel_reorder == 1) 1019 error ("Toplevel reorder must be disabled when unit-at-a-time " 1020 "is disabled."); 1021 flag_toplevel_reorder = 0; 1022 } 1023 /* Unless the user has asked for section anchors, we disable toplevel 1024 reordering at -O0 to disable transformations that might be surprising 1025 to end users and to get -fno-toplevel-reorder tested. */ 1026 if (!optimize && flag_toplevel_reorder == 2 && flag_section_anchors != 1) 1027 { 1028 flag_toplevel_reorder = 0; 1029 flag_section_anchors = 0; 1030 } 1031 if (!flag_toplevel_reorder) 1032 { 1033 if (flag_section_anchors == 1) 1034 error ("section anchors must be disabled when toplevel reorder" 1035 " is disabled"); 1036 flag_section_anchors = 0; 1037 } 1038 1039 if (first_time_p) 1040 { 1041 if (flag_pie) 1042 flag_pic = flag_pie; 1043 if (flag_pic && !flag_pie) 1044 flag_shlib = 1; 1045 first_time_p = false; 1046 } 1047 1048 if (optimize == 0) 1049 { 1050 /* Inlining does not work if not optimizing, 1051 so force it not to be done. */ 1052 warn_inline = 0; 1053 flag_no_inline = 1; 1054 } 1055 1056 /* The optimization to partition hot and cold basic blocks into separate 1057 sections of the .o and executable files does not work (currently) 1058 with exception handling. This is because there is no support for 1059 generating unwind info. If flag_exceptions is turned on we need to 1060 turn off the partitioning optimization. */ 1061 1062 if (flag_exceptions && flag_reorder_blocks_and_partition 1063 && (USING_SJLJ_EXCEPTIONS 1064#ifdef TARGET_UNWIND_INFO 1065 || 1 1066#endif 1067 )) 1068 { 1069 inform (input_location, 1070 "-freorder-blocks-and-partition does not work with exceptions on this architecture"); 1071 flag_reorder_blocks_and_partition = 0; 1072 flag_reorder_blocks = 1; 1073 } 1074 1075 /* If user requested unwind info, then turn off the partitioning 1076 optimization. */ 1077 1078 if (flag_unwind_tables && ! targetm.unwind_tables_default 1079 && flag_reorder_blocks_and_partition 1080 && (USING_SJLJ_EXCEPTIONS 1081#ifdef TARGET_UNWIND_INFO 1082 || 1 1083#endif 1084 )) 1085 { 1086 inform (input_location, 1087 "-freorder-blocks-and-partition does not support unwind info on this architecture"); 1088 flag_reorder_blocks_and_partition = 0; 1089 flag_reorder_blocks = 1; 1090 } 1091 1092 /* If the target requested unwind info, then turn off the partitioning 1093 optimization with a different message. Likewise, if the target does not 1094 support named sections. */ 1095 1096 if (flag_reorder_blocks_and_partition 1097 && (!targetm.have_named_sections 1098 || (flag_unwind_tables && targetm.unwind_tables_default 1099 && (USING_SJLJ_EXCEPTIONS 1100#ifdef TARGET_UNWIND_INFO 1101 || 1 1102#endif 1103 )))) 1104 { 1105 inform (input_location, 1106 "-freorder-blocks-and-partition does not work on this architecture"); 1107 flag_reorder_blocks_and_partition = 0; 1108 flag_reorder_blocks = 1; 1109 } 1110 1111 /* Pipelining of outer loops is only possible when general pipelining 1112 capabilities are requested. */ 1113 if (!flag_sel_sched_pipelining) 1114 flag_sel_sched_pipelining_outer_loops = 0; 1115 1116 if (!targetm.ira_cover_classes 1117 && flag_ira_algorithm == IRA_ALGORITHM_CB) 1118 { 1119 inform (input_location, 1120 "-fira-algorithm=CB does not work on this architecture"); 1121 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY; 1122 } 1123 1124 if (flag_conserve_stack) 1125 { 1126 if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME)) 1127 PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100; 1128 if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH)) 1129 PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40; 1130 } 1131 1132 if (flag_lto || flag_whopr) 1133 { 1134#ifdef ENABLE_LTO 1135 flag_generate_lto = 1; 1136 1137 /* When generating IL, do not operate in whole-program mode. 1138 Otherwise, symbols will be privatized too early, causing link 1139 errors later. */ 1140 flag_whole_program = 0; 1141#else 1142 error ("LTO support has not been enabled in this configuration"); 1143#endif 1144 } 1145 1146 /* Reconcile -flto and -fwhopr. Set additional flags as appropriate and 1147 check option consistency. */ 1148 if (flag_lto && flag_whopr) 1149 error ("-flto and -fwhopr are mutually exclusive"); 1150} 1151 1152#define LEFT_COLUMN 27 1153 1154/* Output ITEM, of length ITEM_WIDTH, in the left column, 1155 followed by word-wrapped HELP in a second column. */ 1156static void 1157wrap_help (const char *help, 1158 const char *item, 1159 unsigned int item_width, 1160 unsigned int columns) 1161{ 1162 unsigned int col_width = LEFT_COLUMN; 1163 unsigned int remaining, room, len; 1164 1165 remaining = strlen (help); 1166 1167 do 1168 { 1169 room = columns - 3 - MAX (col_width, item_width); 1170 if (room > columns) 1171 room = 0; 1172 len = remaining; 1173 1174 if (room < len) 1175 { 1176 unsigned int i; 1177 1178 for (i = 0; help[i]; i++) 1179 { 1180 if (i >= room && len != remaining) 1181 break; 1182 if (help[i] == ' ') 1183 len = i; 1184 else if ((help[i] == '-' || help[i] == '/') 1185 && help[i + 1] != ' ' 1186 && i > 0 && ISALPHA (help[i - 1])) 1187 len = i + 1; 1188 } 1189 } 1190 1191 printf( " %-*.*s %.*s\n", col_width, item_width, item, len, help); 1192 item_width = 0; 1193 while (help[len] == ' ') 1194 len++; 1195 help += len; 1196 remaining -= len; 1197 } 1198 while (remaining); 1199} 1200 1201/* Print help for a specific front-end, etc. */ 1202static void 1203print_filtered_help (unsigned int include_flags, 1204 unsigned int exclude_flags, 1205 unsigned int any_flags, 1206 unsigned int columns) 1207{ 1208 unsigned int i; 1209 const char *help; 1210 static char *printed = NULL; 1211 bool found = false; 1212 bool displayed = false; 1213 1214 if (include_flags == CL_PARAMS) 1215 { 1216 for (i = 0; i < LAST_PARAM; i++) 1217 { 1218 const char *param = compiler_params[i].option; 1219 1220 help = compiler_params[i].help; 1221 if (help == NULL || *help == '\0') 1222 { 1223 if (exclude_flags & CL_UNDOCUMENTED) 1224 continue; 1225 help = undocumented_msg; 1226 } 1227 1228 /* Get the translation. */ 1229 help = _(help); 1230 1231 wrap_help (help, param, strlen (param), columns); 1232 } 1233 putchar ('\n'); 1234 return; 1235 } 1236 1237 if (!printed) 1238 printed = XCNEWVAR (char, cl_options_count); 1239 1240 for (i = 0; i < cl_options_count; i++) 1241 { 1242 static char new_help[128]; 1243 const struct cl_option *option = cl_options + i; 1244 unsigned int len; 1245 const char *opt; 1246 const char *tab; 1247 1248 if (include_flags == 0 1249 || ((option->flags & include_flags) != include_flags)) 1250 { 1251 if ((option->flags & any_flags) == 0) 1252 continue; 1253 } 1254 1255 /* Skip unwanted switches. */ 1256 if ((option->flags & exclude_flags) != 0) 1257 continue; 1258 1259 found = true; 1260 /* Skip switches that have already been printed. */ 1261 if (printed[i]) 1262 continue; 1263 1264 printed[i] = true; 1265 1266 help = option->help; 1267 if (help == NULL) 1268 { 1269 if (exclude_flags & CL_UNDOCUMENTED) 1270 continue; 1271 help = undocumented_msg; 1272 } 1273 1274 /* Get the translation. */ 1275 help = _(help); 1276 1277 /* Find the gap between the name of the 1278 option and its descriptive text. */ 1279 tab = strchr (help, '\t'); 1280 if (tab) 1281 { 1282 len = tab - help; 1283 opt = help; 1284 help = tab + 1; 1285 } 1286 else 1287 { 1288 opt = option->opt_text; 1289 len = strlen (opt); 1290 } 1291 1292 /* With the -Q option enabled we change the descriptive text associated 1293 with an option to be an indication of its current setting. */ 1294 if (!quiet_flag) 1295 { 1296 if (len < (LEFT_COLUMN + 2)) 1297 strcpy (new_help, "\t\t"); 1298 else 1299 strcpy (new_help, "\t"); 1300 1301 if (option->flag_var != NULL) 1302 { 1303 if (option->flags & CL_JOINED) 1304 { 1305 if (option->var_type == CLVC_STRING) 1306 { 1307 if (* (const char **) option->flag_var != NULL) 1308 snprintf (new_help + strlen (new_help), 1309 sizeof (new_help) - strlen (new_help), 1310 * (const char **) option->flag_var); 1311 } 1312 else 1313 sprintf (new_help + strlen (new_help), 1314 "%#x", * (int *) option->flag_var); 1315 } 1316 else 1317 strcat (new_help, option_enabled (i) 1318 ? _("[enabled]") : _("[disabled]")); 1319 } 1320 1321 help = new_help; 1322 } 1323 1324 wrap_help (help, opt, len, columns); 1325 displayed = true; 1326 } 1327 1328 if (! found) 1329 { 1330 unsigned int langs = include_flags & CL_LANG_ALL; 1331 1332 if (langs == 0) 1333 printf (_(" No options with the desired characteristics were found\n")); 1334 else 1335 { 1336 unsigned int i; 1337 1338 /* PR 31349: Tell the user how to see all of the 1339 options supported by a specific front end. */ 1340 for (i = 0; (1U << i) < CL_LANG_ALL; i ++) 1341 if ((1U << i) & langs) 1342 printf (_(" None found. Use --help=%s to show *all* the options supported by the %s front-end\n"), 1343 lang_names[i], lang_names[i]); 1344 } 1345 1346 } 1347 else if (! displayed) 1348 printf (_(" All options with the desired characteristics have already been displayed\n")); 1349 1350 putchar ('\n'); 1351} 1352 1353/* Display help for a specified type of option. 1354 The options must have ALL of the INCLUDE_FLAGS set 1355 ANY of the flags in the ANY_FLAGS set 1356 and NONE of the EXCLUDE_FLAGS set. */ 1357static void 1358print_specific_help (unsigned int include_flags, 1359 unsigned int exclude_flags, 1360 unsigned int any_flags) 1361{ 1362 unsigned int all_langs_mask = (1U << cl_lang_count) - 1; 1363 const char * description = NULL; 1364 const char * descrip_extra = ""; 1365 size_t i; 1366 unsigned int flag; 1367 static unsigned int columns = 0; 1368 1369 /* Sanity check: Make sure that we do not have more 1370 languages than we have bits available to enumerate them. */ 1371 gcc_assert ((1U << cl_lang_count) < CL_MIN_OPTION_CLASS); 1372 1373 /* If we have not done so already, obtain 1374 the desired maximum width of the output. */ 1375 if (columns == 0) 1376 { 1377 const char *p; 1378 1379 GET_ENVIRONMENT (p, "COLUMNS"); 1380 if (p != NULL) 1381 { 1382 int value = atoi (p); 1383 1384 if (value > 0) 1385 columns = value; 1386 } 1387 1388 if (columns == 0) 1389 /* Use a reasonable default. */ 1390 columns = 80; 1391 } 1392 1393 /* Decide upon the title for the options that we are going to display. */ 1394 for (i = 0, flag = 1; flag <= CL_MAX_OPTION_CLASS; flag <<= 1, i ++) 1395 { 1396 switch (flag & include_flags) 1397 { 1398 case 0: 1399 break; 1400 1401 case CL_TARGET: 1402 description = _("The following options are target specific"); 1403 break; 1404 case CL_WARNING: 1405 description = _("The following options control compiler warning messages"); 1406 break; 1407 case CL_OPTIMIZATION: 1408 description = _("The following options control optimizations"); 1409 break; 1410 case CL_COMMON: 1411 description = _("The following options are language-independent"); 1412 break; 1413 case CL_PARAMS: 1414 description = _("The --param option recognizes the following as parameters"); 1415 break; 1416 default: 1417 if (i >= cl_lang_count) 1418 break; 1419 if (exclude_flags & all_langs_mask) 1420 description = _("The following options are specific to just the language "); 1421 else 1422 description = _("The following options are supported by the language "); 1423 descrip_extra = lang_names [i]; 1424 break; 1425 } 1426 } 1427 1428 if (description == NULL) 1429 { 1430 if (any_flags == 0) 1431 { 1432 if (include_flags & CL_UNDOCUMENTED) 1433 description = _("The following options are not documented"); 1434 else if (include_flags & CL_SEPARATE) 1435 description = _("The following options take separate arguments"); 1436 else if (include_flags & CL_JOINED) 1437 description = _("The following options take joined arguments"); 1438 else 1439 { 1440 internal_error ("unrecognized include_flags 0x%x passed to print_specific_help", 1441 include_flags); 1442 return; 1443 } 1444 } 1445 else 1446 { 1447 if (any_flags & all_langs_mask) 1448 description = _("The following options are language-related"); 1449 else 1450 description = _("The following options are language-independent"); 1451 } 1452 } 1453 1454 printf ("%s%s:\n", description, descrip_extra); 1455 print_filtered_help (include_flags, exclude_flags, any_flags, columns); 1456} 1457 1458/* Handle target- and language-independent options. Return zero to 1459 generate an "unknown option" message. Only options that need 1460 extra handling need to be listed here; if you simply want 1461 VALUE assigned to a variable, it happens automatically. */ 1462 1463static int 1464common_handle_option (size_t scode, const char *arg, int value, 1465 unsigned int lang_mask) 1466{ 1467 static bool verbose = false; 1468 enum opt_code code = (enum opt_code) scode; 1469 1470 switch (code) 1471 { 1472 case OPT__param: 1473 handle_param (arg); 1474 break; 1475 1476 case OPT_v: 1477 verbose = true; 1478 break; 1479 1480 case OPT_fhelp: 1481 case OPT__help: 1482 { 1483 unsigned int all_langs_mask = (1U << cl_lang_count) - 1; 1484 unsigned int undoc_mask; 1485 unsigned int i; 1486 1487 undoc_mask = (verbose | extra_warnings) ? 0 : CL_UNDOCUMENTED; 1488 /* First display any single language specific options. */ 1489 for (i = 0; i < cl_lang_count; i++) 1490 print_specific_help 1491 (1U << i, (all_langs_mask & (~ (1U << i))) | undoc_mask, 0); 1492 /* Next display any multi language specific options. */ 1493 print_specific_help (0, undoc_mask, all_langs_mask); 1494 /* Then display any remaining, non-language options. */ 1495 for (i = CL_MIN_OPTION_CLASS; i <= CL_MAX_OPTION_CLASS; i <<= 1) 1496 print_specific_help (i, undoc_mask, 0); 1497 exit_after_options = true; 1498 break; 1499 } 1500 1501 case OPT_ftarget_help: 1502 case OPT__target_help: 1503 print_specific_help (CL_TARGET, CL_UNDOCUMENTED, 0); 1504 exit_after_options = true; 1505 1506 /* Allow the target a chance to give the user some additional information. */ 1507 if (targetm.target_help) 1508 targetm.target_help (); 1509 break; 1510 1511 case OPT_fhelp_: 1512 case OPT__help_: 1513 { 1514 const char * a = arg; 1515 unsigned int include_flags = 0; 1516 /* Note - by default we include undocumented options when listing 1517 specific classes. If you only want to see documented options 1518 then add ",^undocumented" to the --help= option. E.g.: 1519 1520 --help=target,^undocumented */ 1521 unsigned int exclude_flags = 0; 1522 1523 /* Walk along the argument string, parsing each word in turn. 1524 The format is: 1525 arg = [^]{word}[,{arg}] 1526 word = {optimizers|target|warnings|undocumented| 1527 params|common|<language>} */ 1528 while (* a != 0) 1529 { 1530 static struct 1531 { 1532 const char * string; 1533 unsigned int flag; 1534 } 1535 specifics[] = 1536 { 1537 { "optimizers", CL_OPTIMIZATION }, 1538 { "target", CL_TARGET }, 1539 { "warnings", CL_WARNING }, 1540 { "undocumented", CL_UNDOCUMENTED }, 1541 { "params", CL_PARAMS }, 1542 { "joined", CL_JOINED }, 1543 { "separate", CL_SEPARATE }, 1544 { "common", CL_COMMON }, 1545 { NULL, 0 } 1546 }; 1547 unsigned int * pflags; 1548 const char * comma; 1549 unsigned int lang_flag, specific_flag; 1550 unsigned int len; 1551 unsigned int i; 1552 1553 if (* a == '^') 1554 { 1555 ++ a; 1556 pflags = & exclude_flags; 1557 } 1558 else 1559 pflags = & include_flags; 1560 1561 comma = strchr (a, ','); 1562 if (comma == NULL) 1563 len = strlen (a); 1564 else 1565 len = comma - a; 1566 if (len == 0) 1567 { 1568 a = comma + 1; 1569 continue; 1570 } 1571 1572 /* Check to see if the string matches an option class name. */ 1573 for (i = 0, specific_flag = 0; specifics[i].string != NULL; i++) 1574 if (strncasecmp (a, specifics[i].string, len) == 0) 1575 { 1576 specific_flag = specifics[i].flag; 1577 break; 1578 } 1579 1580 /* Check to see if the string matches a language name. 1581 Note - we rely upon the alpha-sorted nature of the entries in 1582 the lang_names array, specifically that shorter names appear 1583 before their longer variants. (i.e. C before C++). That way 1584 when we are attempting to match --help=c for example we will 1585 match with C first and not C++. */ 1586 for (i = 0, lang_flag = 0; i < cl_lang_count; i++) 1587 if (strncasecmp (a, lang_names[i], len) == 0) 1588 { 1589 lang_flag = 1U << i; 1590 break; 1591 } 1592 1593 if (specific_flag != 0) 1594 { 1595 if (lang_flag == 0) 1596 * pflags |= specific_flag; 1597 else 1598 { 1599 /* The option's argument matches both the start of a 1600 language name and the start of an option class name. 1601 We have a special case for when the user has 1602 specified "--help=c", but otherwise we have to issue 1603 a warning. */ 1604 if (strncasecmp (a, "c", len) == 0) 1605 * pflags |= lang_flag; 1606 else 1607 fnotice (stderr, 1608 "warning: --help argument %.*s is ambiguous, please be more specific\n", 1609 len, a); 1610 } 1611 } 1612 else if (lang_flag != 0) 1613 * pflags |= lang_flag; 1614 else 1615 fnotice (stderr, 1616 "warning: unrecognized argument to --help= option: %.*s\n", 1617 len, a); 1618 1619 if (comma == NULL) 1620 break; 1621 a = comma + 1; 1622 } 1623 1624 if (include_flags) 1625 print_specific_help (include_flags, exclude_flags, 0); 1626 exit_after_options = true; 1627 break; 1628 } 1629 1630 case OPT_fversion: 1631 case OPT__version: 1632 exit_after_options = true; 1633 break; 1634 1635 case OPT_G: 1636 g_switch_value = value; 1637 g_switch_set = true; 1638 break; 1639 1640 case OPT_O: 1641 case OPT_Os: 1642 /* Currently handled in a prescan. */ 1643 break; 1644 1645 case OPT_Werror_: 1646 enable_warning_as_error (arg, value, lang_mask); 1647 break; 1648 1649 case OPT_Wlarger_than_: 1650 /* This form corresponds to -Wlarger-than-. 1651 Kept for backward compatibility. 1652 Don't use it as the first argument of warning(). */ 1653 1654 case OPT_Wlarger_than_eq: 1655 larger_than_size = value; 1656 warn_larger_than = value != -1; 1657 break; 1658 1659 case OPT_Wframe_larger_than_: 1660 frame_larger_than_size = value; 1661 warn_frame_larger_than = value != -1; 1662 break; 1663 1664 case OPT_Wstrict_aliasing: 1665 set_Wstrict_aliasing (value); 1666 break; 1667 1668 case OPT_Wstrict_aliasing_: 1669 warn_strict_aliasing = value; 1670 break; 1671 1672 case OPT_Wstrict_overflow: 1673 warn_strict_overflow = (value 1674 ? (int) WARN_STRICT_OVERFLOW_CONDITIONAL 1675 : 0); 1676 break; 1677 1678 case OPT_Wstrict_overflow_: 1679 warn_strict_overflow = value; 1680 break; 1681 1682 case OPT_Wunused: 1683 warn_unused = value; 1684 break; 1685 1686 case OPT_aux_info: 1687 case OPT_aux_info_: 1688 aux_info_file_name = arg; 1689 flag_gen_aux_info = 1; 1690 break; 1691 1692 case OPT_auxbase: 1693 aux_base_name = arg; 1694 break; 1695 1696 case OPT_auxbase_strip: 1697 { 1698 char *tmp = xstrdup (arg); 1699 strip_off_ending (tmp, strlen (tmp)); 1700 if (tmp[0]) 1701 aux_base_name = tmp; 1702 } 1703 break; 1704 1705 case OPT_d: 1706 decode_d_option (arg); 1707 break; 1708 1709 case OPT_dumpbase: 1710 dump_base_name = arg; 1711 break; 1712 1713 case OPT_dumpdir: 1714 dump_dir_name = arg; 1715 break; 1716 1717 case OPT_falign_functions_: 1718 align_functions = value; 1719 break; 1720 1721 case OPT_falign_jumps_: 1722 align_jumps = value; 1723 break; 1724 1725 case OPT_falign_labels_: 1726 align_labels = value; 1727 break; 1728 1729 case OPT_falign_loops_: 1730 align_loops = value; 1731 break; 1732 1733 case OPT_fbranch_probabilities: 1734 flag_branch_probabilities_set = true; 1735 break; 1736 1737 case OPT_fcall_used_: 1738 fix_register (arg, 0, 1); 1739 break; 1740 1741 case OPT_fcall_saved_: 1742 fix_register (arg, 0, 0); 1743 break; 1744 1745 case OPT_fdbg_cnt_: 1746 dbg_cnt_process_opt (arg); 1747 break; 1748 1749 case OPT_fdbg_cnt_list: 1750 dbg_cnt_list_all_counters (); 1751 break; 1752 1753 case OPT_fdebug_prefix_map_: 1754 add_debug_prefix_map (arg); 1755 break; 1756 1757 case OPT_fdiagnostics_show_location_: 1758 if (!strcmp (arg, "once")) 1759 diagnostic_prefixing_rule (global_dc) = DIAGNOSTICS_SHOW_PREFIX_ONCE; 1760 else if (!strcmp (arg, "every-line")) 1761 diagnostic_prefixing_rule (global_dc) 1762 = DIAGNOSTICS_SHOW_PREFIX_EVERY_LINE; 1763 else 1764 return 0; 1765 break; 1766 1767 case OPT_fdiagnostics_show_option: 1768 global_dc->show_option_requested = true; 1769 break; 1770 1771 case OPT_fdump_: 1772 if (!dump_switch_p (arg)) 1773 return 0; 1774 break; 1775 1776 case OPT_fexcess_precision_: 1777 if (!strcmp (arg, "fast")) 1778 flag_excess_precision_cmdline = EXCESS_PRECISION_FAST; 1779 else if (!strcmp (arg, "standard")) 1780 flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD; 1781 else 1782 error ("unknown excess precision style \"%s\"", arg); 1783 break; 1784 1785 case OPT_ffast_math: 1786 set_fast_math_flags (value); 1787 break; 1788 1789 case OPT_funsafe_math_optimizations: 1790 set_unsafe_math_optimizations_flags (value); 1791 break; 1792 1793 case OPT_ffixed_: 1794 fix_register (arg, 1, 1); 1795 break; 1796 1797 case OPT_finline_limit_: 1798 case OPT_finline_limit_eq: 1799 set_param_value ("max-inline-insns-single", value / 2); 1800 set_param_value ("max-inline-insns-auto", value / 2); 1801 break; 1802 1803 case OPT_finstrument_functions_exclude_function_list_: 1804 add_comma_separated_to_vector 1805 (&flag_instrument_functions_exclude_functions, arg); 1806 break; 1807 1808 case OPT_finstrument_functions_exclude_file_list_: 1809 add_comma_separated_to_vector 1810 (&flag_instrument_functions_exclude_files, arg); 1811 break; 1812 1813 case OPT_fmessage_length_: 1814 pp_set_line_maximum_length (global_dc->printer, value); 1815 break; 1816 1817 case OPT_fpack_struct_: 1818 if (value <= 0 || (value & (value - 1)) || value > 16) 1819 error ("structure alignment must be a small power of two, not %d", value); 1820 else 1821 { 1822 initial_max_fld_align = value; 1823 maximum_field_alignment = value * BITS_PER_UNIT; 1824 } 1825 break; 1826 1827 case OPT_fpeel_loops: 1828 flag_peel_loops_set = true; 1829 break; 1830 1831 case OPT_fplugin_: 1832#ifdef ENABLE_PLUGIN 1833 add_new_plugin (arg); 1834#else 1835 error ("Plugin support is disabled. Configure with --enable-plugin."); 1836#endif 1837 break; 1838 1839 case OPT_fplugin_arg_: 1840#ifdef ENABLE_PLUGIN 1841 parse_plugin_arg_opt (arg); 1842#else 1843 error ("Plugin support is disabled. Configure with --enable-plugin."); 1844#endif 1845 break; 1846 1847 case OPT_fprofile_arcs: 1848 profile_arc_flag_set = true; 1849 break; 1850 1851 case OPT_finline_functions: 1852 flag_inline_functions_set = true; 1853 break; 1854 1855 case OPT_fprofile_dir_: 1856 profile_data_prefix = xstrdup (arg); 1857 break; 1858 1859 case OPT_fprofile_use_: 1860 profile_data_prefix = xstrdup (arg); 1861 flag_profile_use = true; 1862 value = true; 1863 /* No break here - do -fprofile-use processing. */ 1864 case OPT_fprofile_use: 1865 if (!flag_branch_probabilities_set) 1866 flag_branch_probabilities = value; 1867 if (!flag_profile_values_set) 1868 flag_profile_values = value; 1869 if (!flag_unroll_loops_set) 1870 flag_unroll_loops = value; 1871 if (!flag_peel_loops_set) 1872 flag_peel_loops = value; 1873 if (!flag_tracer_set) 1874 flag_tracer = value; 1875 if (!flag_value_profile_transformations_set) 1876 flag_value_profile_transformations = value; 1877 if (!flag_inline_functions_set) 1878 flag_inline_functions = value; 1879 if (!flag_ipa_cp_set) 1880 flag_ipa_cp = value; 1881 if (!flag_ipa_cp_clone_set 1882 && value && flag_ipa_cp) 1883 flag_ipa_cp_clone = value; 1884 if (!flag_predictive_commoning_set) 1885 flag_predictive_commoning = value; 1886 if (!flag_unswitch_loops_set) 1887 flag_unswitch_loops = value; 1888 if (!flag_gcse_after_reload_set) 1889 flag_gcse_after_reload = value; 1890 break; 1891 1892 case OPT_fprofile_generate_: 1893 profile_data_prefix = xstrdup (arg); 1894 value = true; 1895 /* No break here - do -fprofile-generate processing. */ 1896 case OPT_fprofile_generate: 1897 if (!profile_arc_flag_set) 1898 profile_arc_flag = value; 1899 if (!flag_profile_values_set) 1900 flag_profile_values = value; 1901 if (!flag_value_profile_transformations_set) 1902 flag_value_profile_transformations = value; 1903 if (!flag_inline_functions_set) 1904 flag_inline_functions = value; 1905 break; 1906 1907 case OPT_fprofile_values: 1908 flag_profile_values_set = true; 1909 break; 1910 1911 case OPT_fvisibility_: 1912 { 1913 if (!strcmp(arg, "default")) 1914 default_visibility = VISIBILITY_DEFAULT; 1915 else if (!strcmp(arg, "internal")) 1916 default_visibility = VISIBILITY_INTERNAL; 1917 else if (!strcmp(arg, "hidden")) 1918 default_visibility = VISIBILITY_HIDDEN; 1919 else if (!strcmp(arg, "protected")) 1920 default_visibility = VISIBILITY_PROTECTED; 1921 else 1922 error ("unrecognized visibility value \"%s\"", arg); 1923 } 1924 break; 1925 1926 case OPT_fvpt: 1927 flag_value_profile_transformations_set = true; 1928 break; 1929 1930 case OPT_frandom_seed: 1931 /* The real switch is -fno-random-seed. */ 1932 if (value) 1933 return 0; 1934 set_random_seed (NULL); 1935 break; 1936 1937 case OPT_frandom_seed_: 1938 set_random_seed (arg); 1939 break; 1940 1941 case OPT_fselective_scheduling: 1942 case OPT_fselective_scheduling2: 1943 sel_sched_switch_set = true; 1944 break; 1945 1946 case OPT_fsched_verbose_: 1947#ifdef INSN_SCHEDULING 1948 fix_sched_param ("verbose", arg); 1949 break; 1950#else 1951 return 0; 1952#endif 1953 1954 case OPT_fsched_stalled_insns_: 1955 flag_sched_stalled_insns = value; 1956 if (flag_sched_stalled_insns == 0) 1957 flag_sched_stalled_insns = -1; 1958 break; 1959 1960 case OPT_fsched_stalled_insns_dep_: 1961 flag_sched_stalled_insns_dep = value; 1962 break; 1963 1964 case OPT_fstack_check_: 1965 if (!strcmp (arg, "no")) 1966 flag_stack_check = NO_STACK_CHECK; 1967 else if (!strcmp (arg, "generic")) 1968 /* This is the old stack checking method. */ 1969 flag_stack_check = STACK_CHECK_BUILTIN 1970 ? FULL_BUILTIN_STACK_CHECK 1971 : GENERIC_STACK_CHECK; 1972 else if (!strcmp (arg, "specific")) 1973 /* This is the new stack checking method. */ 1974 flag_stack_check = STACK_CHECK_BUILTIN 1975 ? FULL_BUILTIN_STACK_CHECK 1976 : STACK_CHECK_STATIC_BUILTIN 1977 ? STATIC_BUILTIN_STACK_CHECK 1978 : GENERIC_STACK_CHECK; 1979 else 1980 warning (0, "unknown stack check parameter \"%s\"", arg); 1981 break; 1982 1983 case OPT_fstack_check: 1984 /* This is the same as the "specific" mode above. */ 1985 if (value) 1986 flag_stack_check = STACK_CHECK_BUILTIN 1987 ? FULL_BUILTIN_STACK_CHECK 1988 : STACK_CHECK_STATIC_BUILTIN 1989 ? STATIC_BUILTIN_STACK_CHECK 1990 : GENERIC_STACK_CHECK; 1991 else 1992 flag_stack_check = NO_STACK_CHECK; 1993 break; 1994 1995 case OPT_fstack_limit: 1996 /* The real switch is -fno-stack-limit. */ 1997 if (value) 1998 return 0; 1999 stack_limit_rtx = NULL_RTX; 2000 break; 2001 2002 case OPT_fstack_limit_register_: 2003 { 2004 int reg = decode_reg_name (arg); 2005 if (reg < 0) 2006 error ("unrecognized register name \"%s\"", arg); 2007 else 2008 stack_limit_rtx = gen_rtx_REG (Pmode, reg); 2009 } 2010 break; 2011 2012 case OPT_fstack_limit_symbol_: 2013 stack_limit_rtx = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (arg)); 2014 break; 2015 2016 case OPT_ftree_vectorizer_verbose_: 2017 vect_set_verbosity_level (arg); 2018 break; 2019 2020 case OPT_ftls_model_: 2021 if (!strcmp (arg, "global-dynamic")) 2022 flag_tls_default = TLS_MODEL_GLOBAL_DYNAMIC; 2023 else if (!strcmp (arg, "local-dynamic")) 2024 flag_tls_default = TLS_MODEL_LOCAL_DYNAMIC; 2025 else if (!strcmp (arg, "initial-exec")) 2026 flag_tls_default = TLS_MODEL_INITIAL_EXEC; 2027 else if (!strcmp (arg, "local-exec")) 2028 flag_tls_default = TLS_MODEL_LOCAL_EXEC; 2029 else 2030 warning (0, "unknown tls-model \"%s\"", arg); 2031 break; 2032 2033 case OPT_fira_algorithm_: 2034 if (!strcmp (arg, "CB")) 2035 flag_ira_algorithm = IRA_ALGORITHM_CB; 2036 else if (!strcmp (arg, "priority")) 2037 flag_ira_algorithm = IRA_ALGORITHM_PRIORITY; 2038 else 2039 warning (0, "unknown ira algorithm \"%s\"", arg); 2040 break; 2041 2042 case OPT_fira_region_: 2043 if (!strcmp (arg, "one")) 2044 flag_ira_region = IRA_REGION_ONE; 2045 else if (!strcmp (arg, "all")) 2046 flag_ira_region = IRA_REGION_ALL; 2047 else if (!strcmp (arg, "mixed")) 2048 flag_ira_region = IRA_REGION_MIXED; 2049 else 2050 warning (0, "unknown ira region \"%s\"", arg); 2051 break; 2052 2053 case OPT_fira_verbose_: 2054 flag_ira_verbose = value; 2055 break; 2056 2057 case OPT_ftracer: 2058 flag_tracer_set = true; 2059 break; 2060 2061 case OPT_fipa_cp: 2062 flag_ipa_cp_set = true; 2063 break; 2064 2065 case OPT_fipa_cp_clone: 2066 flag_ipa_cp_clone_set = true; 2067 break; 2068 2069 case OPT_fpredictive_commoning: 2070 flag_predictive_commoning_set = true; 2071 break; 2072 2073 case OPT_funswitch_loops: 2074 flag_unswitch_loops_set = true; 2075 break; 2076 2077 case OPT_fgcse_after_reload: 2078 flag_gcse_after_reload_set = true; 2079 break; 2080 2081 case OPT_funroll_loops: 2082 flag_unroll_loops_set = true; 2083 break; 2084 2085 case OPT_g: 2086 set_debug_level (NO_DEBUG, DEFAULT_GDB_EXTENSIONS, arg); 2087 break; 2088 2089 case OPT_gcoff: 2090 set_debug_level (SDB_DEBUG, false, arg); 2091 break; 2092 2093 case OPT_gdwarf_: 2094 if (value < 2 || value > 4) 2095 error ("dwarf version %d is not supported", value); 2096 else 2097 dwarf_version = value; 2098 set_debug_level (DWARF2_DEBUG, false, ""); 2099 break; 2100 2101 case OPT_ggdb: 2102 set_debug_level (NO_DEBUG, 2, arg); 2103 break; 2104 2105 case OPT_gstabs: 2106 case OPT_gstabs_: 2107 set_debug_level (DBX_DEBUG, code == OPT_gstabs_, arg); 2108 break; 2109 2110 case OPT_gvms: 2111 set_debug_level (VMS_DEBUG, false, arg); 2112 break; 2113 2114 case OPT_gxcoff: 2115 case OPT_gxcoff_: 2116 set_debug_level (XCOFF_DEBUG, code == OPT_gxcoff_, arg); 2117 break; 2118 2119 case OPT_o: 2120 asm_file_name = arg; 2121 break; 2122 2123 case OPT_pedantic_errors: 2124 flag_pedantic_errors = pedantic = 1; 2125 break; 2126 2127 case OPT_fsee: 2128 case OPT_fcse_skip_blocks: 2129 case OPT_floop_optimize: 2130 case OPT_frerun_loop_opt: 2131 case OPT_fsched2_use_traces: 2132 case OPT_fstrength_reduce: 2133 case OPT_ftree_store_copy_prop: 2134 case OPT_fforce_addr: 2135 case OPT_ftree_salias: 2136 case OPT_ftree_store_ccp: 2137 case OPT_Wunreachable_code: 2138 /* These are no-ops, preserved for backward compatibility. */ 2139 break; 2140 2141 case OPT_fuse_linker_plugin: 2142 /* No-op. Used by the driver and passed to us because it starts with f.*/ 2143 break; 2144 2145 default: 2146 /* If the flag was handled in a standard way, assume the lack of 2147 processing here is intentional. */ 2148 gcc_assert (cl_options[scode].flag_var); 2149 break; 2150 } 2151 2152 return 1; 2153} 2154 2155/* Handle --param NAME=VALUE. */ 2156static void 2157handle_param (const char *carg) 2158{ 2159 char *equal, *arg; 2160 int value; 2161 2162 arg = xstrdup (carg); 2163 equal = strchr (arg, '='); 2164 if (!equal) 2165 error ("%s: --param arguments should be of the form NAME=VALUE", arg); 2166 else 2167 { 2168 value = integral_argument (equal + 1); 2169 if (value == -1) 2170 error ("invalid --param value %qs", equal + 1); 2171 else 2172 { 2173 *equal = '\0'; 2174 set_param_value (arg, value); 2175 } 2176 } 2177 2178 free (arg); 2179} 2180 2181/* Used to set the level of strict aliasing warnings, 2182 when no level is specified (i.e., when -Wstrict-aliasing, and not 2183 -Wstrict-aliasing=level was given). 2184 ONOFF is assumed to take value 1 when -Wstrict-aliasing is specified, 2185 and 0 otherwise. After calling this function, wstrict_aliasing will be 2186 set to the default value of -Wstrict_aliasing=level, currently 3. */ 2187void 2188set_Wstrict_aliasing (int onoff) 2189{ 2190 gcc_assert (onoff == 0 || onoff == 1); 2191 if (onoff != 0) 2192 warn_strict_aliasing = 3; 2193 else 2194 warn_strict_aliasing = 0; 2195} 2196 2197/* The following routines are useful in setting all the flags that 2198 -ffast-math and -fno-fast-math imply. */ 2199void 2200set_fast_math_flags (int set) 2201{ 2202 flag_unsafe_math_optimizations = set; 2203 set_unsafe_math_optimizations_flags (set); 2204 flag_finite_math_only = set; 2205 flag_errno_math = !set; 2206 if (set) 2207 { 2208 flag_signaling_nans = 0; 2209 flag_rounding_math = 0; 2210 flag_cx_limited_range = 1; 2211 } 2212} 2213 2214/* When -funsafe-math-optimizations is set the following 2215 flags are set as well. */ 2216void 2217set_unsafe_math_optimizations_flags (int set) 2218{ 2219 flag_trapping_math = !set; 2220 flag_signed_zeros = !set; 2221 flag_associative_math = set; 2222 flag_reciprocal_math = set; 2223} 2224 2225/* Return true iff flags are set as if -ffast-math. */ 2226bool 2227fast_math_flags_set_p (void) 2228{ 2229 return (!flag_trapping_math 2230 && flag_unsafe_math_optimizations 2231 && flag_finite_math_only 2232 && !flag_signed_zeros 2233 && !flag_errno_math); 2234} 2235 2236/* Return true iff flags are set as if -ffast-math but using the flags stored 2237 in the struct cl_optimization structure. */ 2238bool 2239fast_math_flags_struct_set_p (struct cl_optimization *opt) 2240{ 2241 return (!opt->flag_trapping_math 2242 && opt->flag_unsafe_math_optimizations 2243 && opt->flag_finite_math_only 2244 && !opt->flag_signed_zeros 2245 && !opt->flag_errno_math); 2246} 2247 2248/* Handle a debug output -g switch. EXTENDED is true or false to support 2249 extended output (2 is special and means "-ggdb" was given). */ 2250static void 2251set_debug_level (enum debug_info_type type, int extended, const char *arg) 2252{ 2253 static bool type_explicit; 2254 2255 use_gnu_debug_info_extensions = extended; 2256 2257 if (type == NO_DEBUG) 2258 { 2259 if (write_symbols == NO_DEBUG) 2260 { 2261 write_symbols = PREFERRED_DEBUGGING_TYPE; 2262 2263 if (extended == 2) 2264 { 2265#ifdef DWARF2_DEBUGGING_INFO 2266 write_symbols = DWARF2_DEBUG; 2267#elif defined DBX_DEBUGGING_INFO 2268 write_symbols = DBX_DEBUG; 2269#endif 2270 } 2271 2272 if (write_symbols == NO_DEBUG) 2273 warning (0, "target system does not support debug output"); 2274 } 2275 } 2276 else 2277 { 2278 /* Does it conflict with an already selected type? */ 2279 if (type_explicit && write_symbols != NO_DEBUG && type != write_symbols) 2280 error ("debug format \"%s\" conflicts with prior selection", 2281 debug_type_names[type]); 2282 write_symbols = type; 2283 type_explicit = true; 2284 } 2285 2286 /* A debug flag without a level defaults to level 2. */ 2287 if (*arg == '\0') 2288 { 2289 if (!debug_info_level) 2290 debug_info_level = DINFO_LEVEL_NORMAL; 2291 } 2292 else 2293 { 2294 int argval = integral_argument (arg); 2295 if (argval == -1) 2296 error ("unrecognised debug output level \"%s\"", arg); 2297 else if (argval > 3) 2298 error ("debug output level %s is too high", arg); 2299 else 2300 debug_info_level = (enum debug_info_level) argval; 2301 } 2302} 2303 2304/* Return 1 if OPTION is enabled, 0 if it is disabled, or -1 if it isn't 2305 a simple on-off switch. */ 2306 2307int 2308option_enabled (int opt_idx) 2309{ 2310 const struct cl_option *option = &(cl_options[opt_idx]); 2311 2312 if (option->flag_var) 2313 switch (option->var_type) 2314 { 2315 case CLVC_BOOLEAN: 2316 return *(int *) option->flag_var != 0; 2317 2318 case CLVC_EQUAL: 2319 return *(int *) option->flag_var == option->var_value; 2320 2321 case CLVC_BIT_CLEAR: 2322 return (*(int *) option->flag_var & option->var_value) == 0; 2323 2324 case CLVC_BIT_SET: 2325 return (*(int *) option->flag_var & option->var_value) != 0; 2326 2327 case CLVC_STRING: 2328 break; 2329 } 2330 return -1; 2331} 2332 2333/* Fill STATE with the current state of option OPTION. Return true if 2334 there is some state to store. */ 2335 2336bool 2337get_option_state (int option, struct cl_option_state *state) 2338{ 2339 if (cl_options[option].flag_var == 0) 2340 return false; 2341 2342 switch (cl_options[option].var_type) 2343 { 2344 case CLVC_BOOLEAN: 2345 case CLVC_EQUAL: 2346 state->data = cl_options[option].flag_var; 2347 state->size = sizeof (int); 2348 break; 2349 2350 case CLVC_BIT_CLEAR: 2351 case CLVC_BIT_SET: 2352 state->ch = option_enabled (option); 2353 state->data = &state->ch; 2354 state->size = 1; 2355 break; 2356 2357 case CLVC_STRING: 2358 state->data = *(const char **) cl_options[option].flag_var; 2359 if (state->data == 0) 2360 state->data = ""; 2361 state->size = strlen ((const char *) state->data) + 1; 2362 break; 2363 } 2364 return true; 2365} 2366 2367/* Set *OPTION according to VALUE and ARG. */ 2368 2369void 2370set_option (const struct cl_option *option, int value, const char *arg) 2371{ 2372 if (!option->flag_var) 2373 return; 2374 2375 switch (option->var_type) 2376 { 2377 case CLVC_BOOLEAN: 2378 *(int *) option->flag_var = value; 2379 break; 2380 2381 case CLVC_EQUAL: 2382 *(int *) option->flag_var = (value 2383 ? option->var_value 2384 : !option->var_value); 2385 break; 2386 2387 case CLVC_BIT_CLEAR: 2388 case CLVC_BIT_SET: 2389 if ((value != 0) == (option->var_type == CLVC_BIT_SET)) 2390 *(int *) option->flag_var |= option->var_value; 2391 else 2392 *(int *) option->flag_var &= ~option->var_value; 2393 if (option->flag_var == &target_flags) 2394 target_flags_explicit |= option->var_value; 2395 break; 2396 2397 case CLVC_STRING: 2398 *(const char **) option->flag_var = arg; 2399 break; 2400 } 2401} 2402 2403/* Enable a warning option as an error. This is used by -Werror= and 2404 also by legacy Werror-implicit-function-declaration. */ 2405 2406void 2407enable_warning_as_error (const char *arg, int value, unsigned int lang_mask) 2408{ 2409 char *new_option; 2410 int option_index; 2411 2412 new_option = XNEWVEC (char, strlen (arg) + 2); 2413 new_option[0] = 'W'; 2414 strcpy (new_option + 1, arg); 2415 option_index = find_opt (new_option, lang_mask); 2416 if (option_index == N_OPTS) 2417 { 2418 error ("-Werror=%s: No option -%s", arg, new_option); 2419 } 2420 else 2421 { 2422 diagnostic_t kind = value ? DK_ERROR : DK_WARNING; 2423 diagnostic_classify_diagnostic (global_dc, option_index, kind); 2424 2425 /* -Werror=foo implies -Wfoo. */ 2426 if (cl_options[option_index].var_type == CLVC_BOOLEAN 2427 && cl_options[option_index].flag_var 2428 && kind == DK_ERROR) 2429 *(int *) cl_options[option_index].flag_var = 1; 2430 } 2431 free (new_option); 2432} 2433